package com.hmdp.utils;

import lombok.Data;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {

    public static final long BEGIN_TIMESTAMP = 1734882870;
    // 序列号位数
    public static final int COUNT_BITS = 32;
    @Resource
    private RedisTemplate<String, Object> redisTemplate;

    public long nextId(String keyPrefix) {
        // 1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;
        // 2.生成序列号
        // 2.1获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        long count = redisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        // 3.拼接并返回
        timeStamp = (timeStamp << COUNT_BITS) | count;
        return timeStamp;
    }

}
